✨ Support captcha

lib/screens/captcha.dart

@@ -0,0 +1,38 @@
+import 'package:easy_localization/easy_localization.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_inappwebview/flutter_inappwebview.dart';
+import 'package:provider/provider.dart';
+import 'package:surface/providers/config.dart';
+import 'package:surface/widgets/navigation/app_scaffold.dart';
+
+class TurnstileScreen extends StatefulWidget {
+  const TurnstileScreen({
+    super.key,
+  });
+
+  @override
+  State<TurnstileScreen> createState() => _TurnstileScreenState();
+}
+
+class _TurnstileScreenState extends State<TurnstileScreen> {
+  @override
+  Widget build(BuildContext context) {
+    final cfg = context.read<ConfigProvider>();
+    return AppScaffold(
+      appBar: AppBar(title: Text("reCaptcha").tr()),
+      body: InAppWebView(
+        initialUrlRequest: URLRequest(
+          url: WebUri('${cfg.serverUrl}/captcha?redirect_uri=solink://captcha'),
+        ),
+        shouldOverrideUrlLoading: (controller, navigationAction) async {
+          Uri? url = navigationAction.request.url;
+          if (url != null && url.queryParameters.containsKey('captcha_tk')) {
+            Navigator.pop(context, url.queryParameters['captcha_tk']!);
+            return NavigationActionPolicy.CANCEL;
+          }
+          return NavigationActionPolicy.ALLOW;
+        },
+      ),
+    );
+  }
+}